Muscle hypertrophy involves an expansion in size connected with skeletal muscle through a growth in dimensions of its aspect cells. Two factors promote hypertrophy: sarcoplasmic hypertrophy, which often focuses more upon increased muscle glycogen storage devices; and myofibrillar hypertrophy, which often focuses more upon increased myofibril dimensions. However, neither happens in isolation, which is the reason top-level bodybuilders along with strongman competitors are different so greatly throughout muscle size along with strength.